Abstract: Molecularly imprinted polymers are reported as selective solid-phase extraction sorbents for flow injection amperometry for the determination of 4-nitrophenol in water. A graphite pencil electrode modified with multiwalled carbon nanotubes provided good sensitivity and excellent anti-fouling properties. Solid-phase extraction cartridges containing 100 mg of imprinted polymers with a sample volume of 50 mL resulted in a preconcentration factor of 97.7, which allowed determination of 4-nitrophenol at the maximum level permitted by the United States Environmental Protection Agency (60 μg L-1). A linear dynamic range of 5-300 μg L-1 for 4-nitrophenol was obtained with a limit of detection of 1.5 μg L-1. The method was employed for the determination of 4-nitrophenol in water
Author keywords: 4-Nitrophenol, Amperometric detection, Carbon nanotube, Flow injection, Imprinted polymer